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Convert the test file for TestIgnoredExceptions.py to the mach_vm API.

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The previous version of this test uses mprotect, and that seemed to be
flakey on older systems.  I converted the test to use the underlying
mach_vm API's.  The test only runs on Darwin anyway, so this is not a
real limitation, and I'm hoping the lower level API's work more
consistently.
This commit is contained in:
Jim Ingham 2022-05-20 15:14:26 -07:00
parent 190b0f42cf
commit b369762beb
1 changed files with 15 additions and 6 deletions
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21
lldb/test/API/macosx/ignore_exceptions/main.c
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@ -3,25 +3,34 @@
#include <stdlib.h>
#include <sys/mman.h>
#include <stdio.h>
#include <mach/mach.h>
#include <mach/mach_vm.h>
int g_ints[] = {10, 20, 30, 40, 50, 60};
int *g_int_ptr = NULL;
size_t g_size = 10*sizeof(int);
void
saction_handler(int signo, siginfo_t info, void *baton) {
printf("Got into handler.\n");
mprotect(g_ints, sizeof(g_ints), PROT_READ|PROT_WRITE); // stop here in the signal handler
g_ints[0] = 20;
printf("Got into handler.\n"); // stop here in the signal handler
kern_return_t success
= mach_vm_protect(mach_task_self(), g_int_ptr,
g_size, 0, VM_PROT_READ|VM_PROT_WRITE);
g_int_ptr[1] = 20;
}
int
main()
{
mprotect(g_ints, 10*sizeof(int) , PROT_NONE);
kern_return_t vm_result = vm_allocate(mach_task_self(), &g_int_ptr, g_size, VM_FLAGS_ANYWHERE);
for (int i = 0; i < 10; i++)
g_int_ptr[i] = i * 10;
vm_result = mach_vm_protect(mach_task_self(), g_int_ptr, g_size, 0, VM_PROT_NONE);
struct sigaction my_action;
sigemptyset(&my_action.sa_mask);
my_action.sa_handler = (void (*)(int)) saction_handler;
my_action.sa_flags = SA_SIGINFO;
sigaction(SIGBUS, &my_action, NULL); // Stop here to get things going.
int local_value = g_ints[1];
int local_value = g_int_ptr[1];
return local_value; // Break here to make sure we got past the signal handler
}